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La0.67Pb0.33−x K x MnO3 perovskites synthesized by sol–gel method: the effect of potassium substitution on the magnetic and electrical properties

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Abstract

The influence of the potassium substitution for Pb ions in the mixed valence perovskites La0.67Pb0.33−x K x MnO3 (0 ≤ x ≤ 0.15) was investigated by X-ray diffraction, magnetic and electric transport measurements. All the compositions were synthesized using the sol–gel technique. X-ray diffraction and structure refinement showed that they crystallize in the rhombohedral structure with R\({\bar{3}}\)c space group. Upon K doping on Pb sites, the lattice parameters, unit cell volume, and the Mn–O–Mn bond angle were reduced. All the samples exhibited a ferromagnetic–paramagnetic transition and metallic–semiconductor one with increasing temperature. The analysis of the electrical resistivity data concluded that the metallic (ferromagnetic) part of the resistivity (below T M-Sc) can be explained by the following equation ρ(T) = ρ 0 + ρ 2 T 2 + ρ 4.5 T 4.5, signifying the importance of the domain boundary/grain, combination of electron-magnon, electron-electron and electron-phonon scattering processes. At higher-temperature (T > T M-Sc) paramagnetic semiconducting regime, the adiabatic small polarons hopping mechanism (ASPH) was found to fit well.

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Authors and Affiliations

  1. Physics Laboratory of the Condensed Material and the Nanoscience’s, Faculty of Science, University of Monastir, 5019, Monastir, Tunisia

    Asma Zaidi & J. Dhahri

  2. College of Science of Zulfi, Majmaah University, Riyadh, Saudi Arabia

    T. Alharbi, S. Alzobaidi & M. A. Zaidi

  3. Institut Néel, CNRS-Université J. Fourier, BP 166, 38042, Gronoble, France

    E. K. Hlil

Authors
  1. Asma Zaidi
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  2. T. Alharbi
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  3. J. Dhahri
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  4. S. Alzobaidi
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Correspondence to J. Dhahri.

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Zaidi, A., Alharbi, T., Dhahri, J. et al. La0.67Pb0.33−x K x MnO3 perovskites synthesized by sol–gel method: the effect of potassium substitution on the magnetic and electrical properties. Appl. Phys. A 123, 94 (2017). https://doi.org/10.1007/s00339-016-0655-x

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